As a teenager, Emmaline witnesses the murder of her aunt, who was drowned in her swimming pool. The shock of this causes amnesia. She returns to the estate at the age of 21, at her doctor's suggestion, to face her fear. Was it such a good idea after all?
I discovered this little gem via a streaming service, where it was categorized as horror/sci-fi. It really isn't.
It's a tightly plotted murder mystery, and you're kept off-balance by more red herrings than in a fish market. And the misdirection caused me to eventually trust no one in the story -- at least not until the final minutes.
Low-budget, to be sure, but the results transcend the movie's bargain-basement heritage.